Calling device



J. A. HALL.

CALLING DEVICE. APPLICATION FILED JULY 1 2. 191?.

Patented Apr. 20, 1920.

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-' This calling device is UNITED STATES PATENT OFFICE.

JOHN A. HALL, OF EAST ORANGE, NEW JERSEY, ASSIGNOB TO WESTERN ELECTRICCOMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

CALLING nnvrcn:

Specification of Letters Patent. Patented Apr. 20, 1920.

Application filed July 12, 1917. Serial No. 180,162.

To all whom it ma concern:

Be it known that I, JOHN A. HALL, a citizen of the United States,residing at East Orange, in the county of Essex and State of New Jersey,have invented certain new and useful Improvements in Calling Devices, ofwhich the following is a full, clear, concise, and exact description.

This invention relates tocalling devices of the type used in telephonesystems, wherein the subscriber sets up a connection with a calledsubstation without the help of an operator.

In certain telephone systems, such, for 1nstance, as that disclosed inpatent to Clausen. April 16, 1918, No. 1,262,752, one or more series ofkeys are used for controlling relays, which establish a desiredconnection. In such-systems it is the practice to actuate first, aso-called tens key, and then a so-called units key, whereupon a' tensrelay and a units relay will respond and establish a talking pathbetween the calling and called substations. The use of separate keys inthis manner, however, is objectionable in a commercial system by reasonof the space required and the unsightly appearance presented.

The object of the present invention is to provide a calling device foruse in a systemof the kind mentioned, which is similar in appearance andmanipulation to the well known commercial automatic telephone dlalswitch of the present day.

It is thought that the inventlon will be best understood through thefollowing detailed description and drawings, 1n wh1ch Figure 1 is afront view of the calling device, partly in section; Fig. 1s sectionalside View of the same; Fig. 3 1s a detail of the mechanism by which thecalling device, after manipulation, may be restored to 1ts normalcondition; Fig. 4 is a perspective view showing the calling deviceattached to a desk stand, and the manner in which the restoringmechanism of Fig. 3 1s controlled bythe switchhook; and Fig. 5 1s adiagrammatic representation of the effectiveclrcuit set up through theuse of such calling dev1ce.

I particularly applicable to the system described in the patent toClausen hereinbefore referred to, whereand units relays 0f the beforementioned patent. In the operation of this calling device the finger isplaced in the proper finger hold and the dial rotated until the fingercomes up against a stop, when it is with. drawn to allow the dial toreturn to normal, as in the well known present day callmg devices. Therotation of the dial in this case, however, moves a wiper over a seriesof contacts, but does not electrically afiect them until the finger stopis engaged. This stop, unlike that on the ordinary calling device, has aslight movement through which a momentary electrical change is effectedin the circuit connected to that contact upon which the wiper rests. Inthis manner the contacts are selectively affected.

In the preferred arrangement shown In the drawings, the switch is builtup on a frame F. J ournaled in this frame is a shaft S to which isrigidly attached a dial D having the usual number of finger holds.

There are provided two wipers W and W rigidly attached to, but insulatedfrom, the shaft S. Two series of contacts, 0 to 9, inclusive, and 10 to19, inclusive, are arranged in a circle around the shaft S in operativerelation with the wipers W and W respectively. The rotation of the dialthen causes the wiper W to successively engage the contacts 0 to 9, andthe wiper W the contacts 10 to 19.

There are also provided two springs S* and S rigidly attached to, butinsulated from, the frame F, which make sliding contact with the wipersW and W respectively, being always in connection with the same. Thesesprings are so fashioned that their ends form terminals 20 and 21, withwhich a wiper W cooperates. The wiper W is rigidly attached to, butinsulated from, a collar C, mounted on a shaft S also journaled in theframe F.

The shaft S carries, at its upper end, the finger stop 22, and isrotated through the movement of such finger stop.

There is an arm 23, carrying a pawl 24, also rigidly attached to theshaft S A ratchet wheel 25 is rigidly mounted on the collar C andthereby rigidly attached to the wiper W Through the agency of pawl 24,the ratchet wheel 25 may be rotated and retained in its position by aholding pawl 26.

The first encounter of the finger with the finger stop 22 serves torotate the wiper W over and beyond the terminal so as to make a passingcontact therewith. The sec- 0nd encounter of the finger with the stop 22in a like manner rotates the wiper W over and beyond the terminal 21 soas to make a passing contact therewith.

, Connected to the frame F are levers L and L with a link L connectingthe two. This link L carries projections 27 and 28, which cooperate withfingers 29 and 30, which are integral parts of the pawls 24: and 26,respectively. The lever L is connected by a rod 31. with the switchhookin a suitable manner, so that, when the receiver is removed from itshook, the consequent movement of the levers L and L and the connectinglink L is such as to allow the pawls 24 and 26 to engage the ratchetwheel 25. The replacing of the receiver on its hook moves the connectinglink in such a manner that the projections 27 and 28 engage the fingers29 and 30 so as to remove the pawls 24 and 26 from engagement with theratchet whei'l 25 and allow it to return, under the tension of a spring32, to its normal position.

Rigidly attached to the shaft S isa gear wheel G which meshes with thegear wheel G attached to a governing device G, to properly control themovement of the dial D and its attached members.

When the dial D is moved the wipers W and W successively pass over thecontacts 0 to 9, and 10 to 19, inclusive, respectively, and, as thefinger engages the stop 22, the wipers come to rest, each on one of itsassociated contacts. At this time the wiper W' passes over the terminal20 so that a momentary circuit is established in a manner to be morefully described hereinafter. As the finger is removed from the fingerhold, the shaft S and its associated members are returned to normalthrough the agency of with, to battery and ground. The relay R may belocked up in any suitable manner. The wipers W and W are now returned tono mal through the agency of the spring 33, and, upon the secondmanipulation of the dial, when the finger comes in engagement with thestop 22, the wiper W is moved over the terminal 21, whereupon a circuitis momentarilv established then engaged contact in the series 10 to 19,inclusive, a relay connected therewith, to battery and ground.

.What is claimed is:

1. In a calling device, sets of contacts, wipers arranged in operativerelation therewith, a dial provided with finger holds for actuating saidwipers, and means responsive to the angular movement of said dial formomentarily selectively affecting said contacts.

2. In a calling device, sets of contacts, a wiper arran ed in operativerelation 'with each of sai sets of contacts, a rotatably mounted dialprovided with finger holds for actuating said wipers, and meansresponsive to movement of said dial for selectively and" successivelyestablishing a transient circuit through said wipers.

8. n a calling device, sets of contacts, a wiper arranged in operativerelation with each of said sets of contacts, a rotatably mounted dialprovided with finger holds for actuating said wipers, a finger stop, andmeans responsive to the engagement of said finger stop and movement ofsaid dial for selectively aflectin said contacts. '4. In a callingevice, sets of contacts, a Wiper arranged in operative relation witheach of said sets of' contacts, a rotatably mounted dial provided withfinger holds for actuating said wipers, a finger stop, and meanscontrolledby said finger stop for suc cessively establishing a circuitthrough said wipers.

5. In a calling device sets of contacts, a wiper arranged in operativerelation with each of said sets of contacts, a rotatably responsive tothe engagement of said fingerstop for successively establishing acircuit through said wipers, and means responsive to the movement ofsaid dial for selectively affecting said contacts.

6. In a calling device, sets of contacts, a wiper arranged in operativerelation w1th each of said sets of contacts, a movable dial providedwith finger holds for causing the wipers to move over said contacts toselectively engage any one thereof, and means.

operated by the movement of said dial and after a selected contact hasbeen engaged for momentarily establishing a circuit there through.

7 In a calling device, sets of contacts a wiper arran ed'in operativerelation w1th each of saic? sets of contacts, a rotatably mounted dialprovided with finger holds for actuating said wipers, and meansforlimiting the motion of said dial and for momentarily closing a normallyopen circuit throu h said wipers.

8 n a telephone system, sets of relays.

ing said relays comprising means for momentarily energizing a relay of adifferent set upon each manipulation of said device.

9. In a telephone system, sets of relays, and a rotatable calling devicefor selectively operating said relays comprising means for momentarilyenergizing a relay of a difierent set upon each manipulation of saiddevice.

10. In a telephone system, sets of relays, and a finger Wheel callingdevice for selectively operating said relays comprising means formomentarily energizing a relay of a difierent set upon each manipulationof said device.

11. In a telephone system, sets of relays and a calling device forselectively operating said relays, said device comprising sets ofcontacts connected to said relays, a wiper, and means for transientlyestablishing a circuit including said wiper, a' selected contact and arelay connected thereto.

12. In a telephone system sets of relays, and a calling device forselectively operating said relays, said device comprising sets ofcontacts individual to said sets of relays, a Wiper, and means fortransiently establishing a circuitthrough said Wiper including aselected contact and a relay connected thereto in one of said sets, andmeans for subsequently establishing a circuit through said Wiperincluding a selected contact and a relay connected thereto in another ofsaid sets.

13. In a telephone system, series of relays, a calling device foractuating said relays, means included in said calling device to selectand operate a relay of one of said series upon one actuation of saidcalling device, and means to select and operate a relay in another ofsaid series upon a subsequent actuation of said calling device.

14. In a telephone system, series of relays, a calling device foractuating said relays, sets of contacts in said calling deviceindividual to said sets of relays, means included in said calling devicefor transiently establishing a circuit through a selected contact in oneof said sets of contacts, and means included in said calling device fortransiently establishing a circuit through a selected contact in anotherof said sets of contacts.

In witness whereof, I hereunto subscribe my name this 10th day of July,A. D. 1917.

JOHN A. HALL.

